Rhododendron arboreum var. cinnamomeum

Rhododendron arboreum var. cinnamomeum Wall. ex Lindl., Edwards’s Bot. Reg. 23: , pl. 1982 1837. (syn: Rhododendron arboreum subsp. campbelliae (Hook. fil.) Tagg; Rhododendron arboreum subsp. cinnamomeum (Wall. ex Lindl.) Tagg; Rhododendron arboreum var. cinnamomeum (Wall. ex Lindl.) W.K. Hu; Rhododendron campbelliae Hook. fil.; Rhododendron campbelliae Hook. fil.) ?;

S-Tibet, E-Nepal, NE-India, Darjeeling, Vietnam as per Catalogue of Life;

rhododendron for id mm 2 26 05 2012: rhododendron, ericaceae family

near tonglu 3050 m altitude, singalila national park

was blooming profusely

short trees not more than ten feet

would appreciate an id

second week of april this year

reference flowers of india

I suppose there are two individuals (the last photo seems of a different individual). (?)
Also, how was the underside of the leaf? For species identification of Rhododendron much depends on the type of bark, type of hair/ tomentose on the underside of leaves along with the floral aspects.
If the underside has brownish tomentosum, peeling bark exposing inner red layer then it could be R. arboreum subsp. cinnamomeum.

Three links of Rhododendron arboreum ssp. cinnamomeum as have been suggested by …-